Microchip Technology MIC3202-1YME-TR

Overview

MIC3202-1YME-TR from Micrel is a hysteretic step-down constant-current LED driver with integrated high-side MOSFET and high-side current-sense amplifier, delivering ±5% LED current accuracy over 6V–37V input range, supporting up to 1A output current for driving 1–8 series HB LEDs in architectural lighting, MR-16 bulbs, and under-cabinet systems.

For engineers reviewing the MIC3202-1YME-TR datasheet, MIC3202-1YME-TR pinout, MIC3202-1YME-TR application, or MIC3202-1YME-TR equivalent, key selection considerations include dither-disabled operation (vs. MIC3202), 8-pin e-PAD SOIC thermal performance, high-side sensing architecture, 1MHz max switching frequency, and −40°C to +125°C junction temperature rating.

Technical Context

The MIC3202-1YME-TR implements hysteretic (bang-bang) control without compensation components, using internal VCS(MAX)/VCS(MIN) thresholds (212mV/177mV typ.) to regulate inductor current within a fixed hysteresis window. Its high-side current sense enables accurate LED current setting via external RCS resistor, independent of LED forward voltage variation.

Unlike PWM-based controllers, it achieves fast transient response through propagation-delay-limited switching, supports 20kHz max PWM dimming, and integrates over-temperature shutdown (160°C trip) and UVLO (4.0V typ. with 500mV hysteresis). The dither-disabled version eliminates frequency modulation for EMI-sensitive applications requiring deterministic spectral content.

Key Specifications

Pinout & Package

Package: 8-pin e-PAD SOIC (ME) with exposed thermal pad connected to PGND - provides low-thermal-resistance path (θ_JC = 14.7°C/W) for efficient heat dissipation in high-current LED drivers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HB LED driver applications.

Compared with LM3409MY/NOPB and AL8862SP-13, the MIC3202-1YME-TR offers lowest component count (integrated MOSFET + LDO), highest accuracy (±5% vs. ±8%), and smallest solution size-ideal for space-constrained 1A LED modules where deterministic EMI behavior is critical.

Availability

MIC3202-1YME-TR is available at Aetrix Electronics and suitable for architectural lighting, MR-16 LED bulb replacements, and under-cabinet lighting systems requiring stable component supply, long-term manufacturability, and RoHS-compliant green packaging.

Supply support for MIC3202-1YME-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Micrel Inc. was a Silicon Valley semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015; known for high-reliability LED drivers and Ethernet PHYs.

The MIC3202 family was designed specifically for cost-sensitive, high-efficiency HB LED lighting applications demanding wide input range, ±5% current accuracy, and minimal external components-targeting retrofit bulbs, signage, and commercial interior lighting.

FAQ

What is the key functional difference between MIC3202-1YME-TR and MIC3202YME-TR?

The MIC3202-1YME-TR is the dither-disabled variant of the MIC3202 family, omitting the ±12% frequency dither feature present in MIC3202YME-TR. This results in a deterministic switching spectrum ideal for EMI-sensitive lighting installations where predictable noise peaks must be filtered. Both share identical pinout, electrical specs, and thermal characteristics; only the internal dither generator is disabled in MIC3202-1YME-TR.

Can MIC3202-1YME-TR drive eight 1A LEDs in series?

Yes, the MIC3202-1YME-TR is explicitly rated to drive up to eight 1A HB LEDs in series, as confirmed in the Functional Description section of the datasheet. Its 37V maximum input voltage and hysteretic control architecture maintain regulation across the full LED string voltage range (e.g., 8 × 3.5V = 28V), provided the inductor and Schottky diode are appropriately rated for peak voltage and current.

What is the recommended value for the external current-sense resistor (RCS) when setting 1A LED current?

For 1A LED current, the recommended RCS value is 0.2Ω (1206 SMD), as listed in Table 1 of the datasheet. This value is derived from the equation RCS = (VCS(MAX) − VCS(MIN)) / (2 × ILED), using typical thresholds of 212mV and 177mV, yielding 0.0175Ω hysteresis window; the 0.2Ω resistor ensures ±5% accuracy while accommodating power dissipation (0.2W) and thermal stability.

Does MIC3202-1YME-TR require external compensation components?

No, the MIC3202-1YME-TR uses a hysteretic (bang-bang) control architecture that does not require external compensation components such as error amplifier feedback networks or phase compensation capacitors. Its operation relies solely on internal VCS(MAX)/VCS(MIN) thresholds and inductor current hysteresis, simplifying design and eliminating stability concerns associated with traditional current-mode controllers.

How does the high-side current-sense architecture of MIC3202-1YME-TR benefit multi-string LED configurations?

The high-side current-sense architecture of MIC3202-1YME-TR allows the LED cathodes to be grounded, enabling direct connection to standard microcontroller GPIOs or PWM generators without level-shifting. It also preserves the full common-mode voltage range for monitoring multiple parallel LED strings with separate current-sense resistors, unlike low-side sensing which introduces ground-loop complications and limits string configuration flexibility.